Transparent neither in style nor intent, Darkroom’s second album is demanding, mysterious; trickily opaque. This is not an unfamiliar position for this most obscure, obscured and inexplicable of ambient/illbient groups. The billowing instrumentals of Darkroom’s first album, ‘Daylight‘, made their points obliquely through a spray of trip-hop grace, thick detail and industrial derangement. About half of ‘Seethrough’ follows a similar path – baleful/beautiful semi-improvised noisescapes of layered electronics, angrily-stewing loop guitar and naked caress-through-to-howl vocals.

Resident synth necromancer Os fires off ratlike background rattles and spectral drum’n’bass rhythm triggers on the glutinous and dubbed-up Galaxy Craze, a threatening arrhythmic undulation in which Tim Bowness’ minimal, wraith-like subway singing is menaced by a fretless bass guitar part which probes like a giant animal’s tongue. On Charisma Carpenter, old-school ’80s synthpop riffs underpin the dense aviary heat of Michael Bearpark’s textured guitar. These OMD-styled tinklings make an unexpectedly cheerful counterpart to Tim’s lustrous and vaporous vocal chanting, which remains the most bizarre aspect of Darkroom’s music. Singing mere tumbling vowels, or sounds on the edge of becoming words, Tim delivers them with an eerily precise and chilly diction: like droplets of love-song which freeze to alien sleet as soon as they leave his mouth.

In spite of the textural invention and intelligence at work, only Kaylenz hints at the shocking intensity of Darkroom at full, live, improvising intensity. It takes up fourteen sprawling, disorientating minutes of the album, during which the tension between the celestial and the pestilential growing ever more violent. Electronica loops shade upwards into alarm, distorted hospital bells shrill. Mike’s country-toned guitar tang gives way to sharp buzz-edged swarming, while Tim’s vocals travel from weary, loving sorrow to a hysterical pitch of recriminations and a dash of lyrical perversity. Just before Kaylenz steps up – or breaks down – into a chaotic torrent of frighteningly emotional randomness, we hear Tim singing in a lost corner of the studio: a bored, beautiful, detached whisper of “you again, you again – / who’s to blame, if it’s all the same?”

This brings us to the wild card of ‘Seethrough’ – the presentation of Darkroom’s songwriting side, in which they sketch withering surreal portraits of disenchantment and alienation helped along by spacey glissandos of electric slide guitar. They’ve dabbled in words before (on the drum’n’bass/Fripp & Eno soundclash of the Carpetworld single) but here it’s more leisurely, more controlled; more disturbing. In some ways it’s an extension of Tim’s work on the cryptic dark-city musings of No-Man’s ‘Wild Opera’. In others it reflects the burnt-out, amoral contemplations of Tricky’s surreal, spliff-fuelled ‘Maxinquaye’.

If so, this is Tricky as played by Alec Guinness, dropping casual, vinegar-dry references to both Def Leppard and Janet Frame while somehow maintaining a ghostly mystique unhindered by the flapping of library cards. On the bobbing Morricone-meets-Orb dub of King Of The Cowboy Singers, Tim’s guarded, musical speaking voice recites both nonsense and significance to the beat – “trying to find a new life in an old boot, / walking to the new place in your old suit – / the king of the cowboy singers, / the toast of the Old School dinners…” The roiling, improvised star-stuff that usually pools out of Darkroom’s speakers is swapped for Dada-tinged narratives of shifting identities and habits; of introverted, stiffly English insanity and implosions of a starchy order.

Having said that, although Darkroom no longer quite sound as if they’re playing live from the surface of the sun, they’ve only retreated as far as a ski-lodge on Mercury. The glimpses of sky are always a bright merciless glare, the ground always dry dust; the scenery just a few steps away from white-out. Surly and blinded, Bludgeon Riffola surfaces through a swimming of harness bells as a filthy punk-blues fed through post-rock processing and glowing tracer-paths of needling synth-noise, Tim’s petulant vocals rope-swung and curdled with distortion.

The album’s masterpiece – the ten-minute stretch of Bottleneck – is blindingly white and exposed; a sinister mixture of Aphex Twin and Bill Frisell. Sparse, desolate slide guitar is chewed at by Os’ echoing dead-sea-surf static and smeared brass textures. Tim’s lonesome vocal (once it finally arrives) rides a stately dance of plucked orchestra strings, drawing out the shapes of a puzzle of betrayal and disgust. The charges are clear – “You never really loved your wife… / you never really knew your boys… / you never even liked the girl you said had claimed your heart – restart, restart.” But the story’s obscured: gaps between snapshots swallow it up. The figure of a man is reduced to a hat, a cigarette; an unfinished meal; an absence.

Then again, Darkroom aren’t here to provide clarity. Seethrough itself seals the album in a light and feverish running pulse, frosted by far-off gilded sprays of reserved prog-rock guitar. It’s tremulously sweet and frantic – trance-techno that’s neurotic rather than narcotic – and with a blurred, vocoder-ed vocal that queries the giddy transcendence of the music. “Too much misunderstanding; too much, too little love. / Too much to keep your hand in, too much to float above.” Dancing lightly on its feet, it moves with the crowd only to slip away quietly as the dreams evaporate. “Too much deliberation, too much you want to be. / Too much anticipation, too much you’ll never see – see through, seethrough.”

Blink, and it’s gone. Darkroom tease us with clarity, but lead us to a vanishing in the end.